Coahuilaceratops

Coahuilaceratops (meaning "Coahuila horn face") is a genus of herbivorous ceratopsian dinosaur. It is a chasmosaurine ceratopsian which lived during the Late Cretaceous period (late Campanian stage) in what is now southern Coahuila in northern Mexico. It is known from the holotype CPC 276, a partial skeleton of an adult individual which includes several skull elements. Another specimen, CPS 277, may represent a juvenile Coahuilaceratops. All specimens of Coahuilaceratops were collected from a single location in the middle strata of the Cerro del Pueblo Formation, which dates to between 72.5 and 71.4 million years ago.[1]

Restoration.

Coahuilaceratops
Temporal range: Late Cretaceous
~72.5–71.4 Ma
↓
Skull of Coahuilaceratops
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: †Ornithischia
Family: †Ceratopsidae
Subfamily: †Chasmosaurinae
Genus: †Coahuilaceratops
Loewen et al., 2010
Species:
†C. magnacuerna
Binomial name
†Coahuilaceratops magnacuerna
Loewen et al., 2010

It was formally described in 2010, though it appeared as an informal designation (nomen nudum) as early as 2008.[2] Coahuilaceratops was named by Mark A. Loewen, Scott D. Sampson, Eric K. Lund, Andrew A. Farke, Martha C. Aguillón-Martínez, C.A. de Leon, R.A. Rodríguez-de la Rosa, Michael A. Getty and David A. Eberth in 2010 and the type species is Coahuilaceratops magnacuerna.[1] Although based on incomplete remains, Coahuilaceratops is thought to possess among the largest horns of any dinosaur currently known, rivaling in absolute size those of larger chasmosaurines like Triceratops and Torosaurus. Its horns are estimated to have been up to 1.2 m (4 feet) long.[3][1] In 2012 Thomas Hotlz gave a length of 8 meters (26 ft).[4]

Systematics

Coahuilaceratops is a member of the Chasmosaurinae. Below is a cladogram that represents the findings of Caleb Brown and Donald Henderson (2015). Coahuilaceratops and Bravoceratops were resolved as sister taxa yet in a recent analysis by Mallon et al. Bravoceratops was removed from the Chasmosaurinae entirely because it decreased resolution in the authors' analysis.[5][6]

Chasmosaurinae
 
 

Vagaceratops irvinensis

 
 

Kosmoceratops richardsoni

 
 
 
 
 
 
 
 
 

Chasmosaurus belli

 
 

Chasmosaurus russeli

 
 
 

Mojoceratops perifania

 
 
 

Agujaceratops mariscalensis

 
 
 
 

Utahceratops gettyi

 
 

Pentaceratops sternbergii

 
 
 
 
 

Bravoceratops polyphemus

 
 

Coahuilaceratops magnacuerna

 
 
 
 
 
 

Anchiceratops ornatus

 
 

Arrhinoceratops brachyops

 
 
 
Triceratopsini
 
 

Regaliceratops peterhewsi

 
 

Eotriceratops xerinsularis

 
 

Ojoceratops fowleri

 
 
 

Titanoceratops ouranos

 
 
 

Nedoceratops hatcheri

 
 
 
 

Torosaurus latus

 
 

Torosaurus utahensis

 
 
 
 

Triceratops prorsus

 
 

Triceratops horridus

 
 
 
 
 
 
 
 
 
 
 

See also

References
  1. Loewen, M.A., Sampson, S.D., Lund, E.K., Farke, A.A., Aguillón-Martínez, M.C., de Leon, C.A., Rodríguez-de la Rosa, R.A., Getty, M.A., Eberth, D.A., 2010, "Horned Dinosaurs (Ornithischia: Ceratopsidae) from the Upper Cretaceous (Campanian) Cerro del Pueblo Formation, Coahuila, Mexico", In: Michael J. Ryan, Brenda J. Chinnery-Allgeier, and David A. Eberth (eds), New Perspectives on Horned Dinosaurs: The Royal Tyrrell Museum Ceratopsian Symposium, Indiana University Press, 656 pp.
  2. Gozález, Edgar (2008-11-20). "Hallan en Coahuila nuevo dinosaurio". Vanguardia (in Spanish). Retrieved 2009-10-11.
  3. http://www.eurekalert.org/pub_releases/2010-05/uou-fhd052510.php eurekalert - First horned dinosaur from Mexico
  4. Holtz Jr., Thomas R. (2012). "Holtz's Genus List" (PDF).
  5. Brown, Caleb M.; Henderson, Donald M. (June 4, 2015). "A new horned dinosaur reveals convergent evolution in cranial ornamentation in ceratopsidae". Current Biology. 25 (online): 1641–8. doi:10.1016/j.cub.2015.04.041. PMID 26051892.
  6. Jordan C. Mallon, Christopher J. Ott, Peter L. Larson, Edward M. Iuliano and David C. Evans (2016). "Spiclypeus shipporum gen. et sp. nov., a Boldly Audacious New Chasmosaurine Ceratopsid (Dinosauria: Ornithischia) from the Judith River Formation (Upper Cretaceous: Campanian) of Montana, USA". PLoS ONE. 11 (5): e0154218. doi:10.1371/journal.pone.0154218. PMC 4871577. PMID 27191389.CS1 maint: uses authors parameter (link)


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